An enraged whale will attack a ship. A famous __5__ of this was the fate of whaler Essex, which was sunk __6__ South America early in the last century. More recently, steel ships have had their plates buckled in the same way. Sperm whales were known to __7__ the old-time whaleboats in their jaws and crush them.

　　The greatest mystery of whales is their diving ability. The sperm whale __8__ the bottom for his favourite food, the octopus. __9__ he is known to go as far down as 3,200 feet, where the pressure is 1,400 pounds, to the square inch. Doing __10__ he will remain submerged as long as one hour. Two feats are involved in this : storing up enough __11__ and withstanding the great change in pressure. Just __12__ he dose it scientists have not determined. It is believed that some of the oxygen is stored in a special system of blood vessels, rather than just held in the lungs. And __13__ that a special kind of oil in his head is some sort of compensating mechanism that automatically adjusts the internal pressure of his body. But __14__ you cant bring a live whale into the laboratory for study, no one __15__ just how these things work.

　　EXERCISE:

　　1. A)Their B)His C)Theirs D)Its

　　2. A)strength B)width C)height D)length

　　3. A)eaten B)crashed C)towed D)lifted

　　4. A)distance B)rate C)voyage D)sail

　　5. A)picture B)film C)example D)book

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